Earthquake · reviewed by a seismologist
M 2.7md
Earthquake near Sonoma, CA
No earthquake was likely felt in Sonoma in the 24 hours to 7:43 am PST (15:43 UTC). The last one was M 2.4, 19 km (12 mi) ESE, at 10:47 am PDT on 6 October 2026, estimated intensity II (weak) in town; 1 felt report to USGS. Every earthquake near Sonoma
This page: a magnitude 2.7 earthquake was recorded 4 km (2 mi) east of Sonoma, CA, at 11:55 am PDT on 14 September 2022 (18:55 UTC), 6.6 km deep. 103 people have reported feeling it to USGS.
USGS: 4km E of Sonoma, CA
10 km (6 mi) W of Napa, CA · 56 km (35 mi) N of San Francisco, CA
- When
- 11:55 am PDT on 14 September 2022 ()
- Where
- 4 km (2 mi) east of Sonoma, CA · earthquakes near Sonoma
- Magnitude
- M 2.7 (md)
- Depth
- 6.6 km below the surface
- Felt
- 103 reports · strongest reported intensity III
- Nearest
- Napa County, 26 km NNE
- Nearest mapped fault
- West Napa fault, 6 km from its surface trace — near is not the same as on
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1154 days ago
Earthquake alerts for Sonoma, CA
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Alerts are on for .
Not a warning. An alert comes after USGS publishes a quake, usually minutes after the shaking. For early warning use ShakeAlert, through your phone's Wireless Emergency Alerts or the MyShake app.
This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.
At this magnitude and depth, people at rest would likely notice it out to about 24 km (15 mi) from the epicentre. In Sonoma, 4 km away, the estimate is intensity III (weak). Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.
Likely felt in: Agua Caliente 8 km, intensity III · Napa 11 km, intensity III · Kenwood 18 km, intensity II · Petaluma 20 km, intensity II · Black Point-Green Point 21 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 310 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 50,000× the energy of this one
- Magna, Utah 2020 M 5.7 35,000× the energy of this one
- Around the size people start to feel M 3.0 3.1× the energy of this one
- This earthquake M 2.7 about 310 lb of TNT
Energy from the Gutenberg–Richter relation (log10E = 1.5M + 4.8), rounded to two figures; bar length is magnitude, which is already a logarithm of energy. Magnitudes of past earthquakes from the USGS catalogue.
For this area
The largest earthquake within 50 km since 2016 was M 4.5 on 2019-10-15 — about 480 times the energy of this one.
Before 2016, the USGS record lists 4 earthquakes of M5 or more within 50 km:
- 6.0 The 2014 South Napa, California Earthquake · 12 km SE of this epicentre
- 5.4 South of Elmira, California · 45 km E of this epicentre
- 5.3 3 km E of Bloomfield, California · 34 km W of this epicentre
- 5.3 Northern California · 36 km W of this epicentre
Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.
Where
Epicentre 38.2855, -122.4135. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Napa County, CA | 26 km (16 mi) | NNE | earthquakes near Napa County |
| Marin County, CA | 39 km (24 mi) | SW | earthquakes near Marin County |
| Solano County, CA | 41 km (26 mi) | E | earthquakes near Solano County |
| Sonoma County, CA | 52 km (32 mi) | WNW | earthquakes near Sonoma County |
| Contra Costa County, CA | 57 km (36 mi) | SE | earthquakes near Contra Costa County |
| Yolo County, CA | 62 km (39 mi) | NE | earthquakes near Yolo County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
51 earthquakes have been recorded within 50 km since this one.
- 1.7 5km E of Vallejo, CA
- 2.0 6km NNE of Windsor, CA
- 1.5 9km ESE of Yountville, CA
- 1.7 14km E of Angwin, CA
- 1.5 15km E of Angwin, CA
- 2.1 2km SSE of Angwin, CA
- 2.2 2km SSE of Angwin, CA
- 1.6 7km S of Calistoga, CA
- 1.8 7km S of Calistoga, CA
- 2.1 2km E of Berkeley, CA
- 1.8 5km SW of Yountville, CA
- 1.7 5km E of Vallejo, CA
- 1.7 3km SW of El Cerrito, CA
- 1.7 11km N of Bay Point, CA
- 2.0 10km NNE of Bay Point, CA
Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of . QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.
On USGS
- The official USGS event page — the source of record for every value above
- Did you feel it? Report it to USGS — reports go to USGS, not to us
- ShakeMap for this event, when USGS has produced one
QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.